Mayotte (French: Mayotte, pronounced [majɔt]; Shimaore: Maore, IPA: [maˈore]; Malagasy: Mahori) is an insular department and region of France officially named the Department of Mayotte (French: Département de Mayotte). It consists of a main island, Grande-Terre (or Maore), a smaller island, Petite-Terre (or Pamanzi), and several islets around these two. The archipelago is located in the northern Mozambique Channel in the Indian Ocean off the coast of Southeast Africa, between northwestern Madagascar and northeastern Mozambique. The department status of Mayotte is recent and the region remains the poorest in France. Mayotte is nevertheless much more prosperous than the other countries of the Mozambique Channel, making it a major destination for illegal immigration.

Mayotte's area is 374 square kilometres (144 sq mi) and, with its 212,645 people, is very densely populated at 569 per km² (1,473 per sq mi). The biggest city and prefecture is Mamoudzou on Grande-Terre. However, the Dzaoudzi–Pamandzi International Airport is located on the neighbouring island of Petite-Terre. The territory is geographically part of the Comoro Islands. The territory is also known as Maore, the native name of its main island, especially by advocates of its inclusion in the Union of Comoros.

The language of the majority is Shimaore, a Bantu language variety closely related to the varieties in the neighbouring Comoros islands. The second most widely spoken native language is Kibushi, a Malagasy language variety most closely related to the Sakalava dialect of Malagasy with influences from Shimaore. The vast majority of the population is Muslim.

The island was populated from neighbouring East Africa with later arrival of Arabs, who brought Islam. A sultanate was established in 1500. In the 19th century, Mayotte was conquered by Andriantsoly, former king of Iboina on Madagascar, and later by the neighbouring islands Mohéli and then Anjouan before being purchased by France in 1841. The people of Mayotte voted to remain politically a part of France in the 1974 referendum. Mayotte became an overseas department on 31 March 2011 and became an outermost region of the European Union on 1 January 2014, following a 2009 referendum with an overwhelming result in favour of the department status.